我想实现融合位置以获取当前位置。 我是在link
的帮助下完成的我的googleAPiCLient已连接。但位置始终为空
在我的清单文件中，我已经把这个
<meta-data android:name="com.google.android.gms.version"
android:value="5089000" />
我创建了一个单独的Fusionclass。
我的融合课 -
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import android.app.Activity;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import com.XXX.constants.LogConstants;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.FusedLocationProviderApi;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
public class FusedLocation implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
private static final long INTERVAL = 1000 * 30;
private static final long FASTEST_INTERVAL = 1000 * 5;
private static final long ONE_MIN = 1000 * 60;
private static final long REFRESH_TIME = ONE_MIN * 5;
// private static final float MINIMUM_ACCURACY = 50.0f;
Activity LauncherActivity;
private LocationRequest locationRequest;
private GoogleApiClient googleApiClient;
private Location location;
private FusedLocationProviderApi fusedLocationProviderApi = LocationServices.FusedLocationApi;
public FusedLocation(Activity LauncherActivity) {
locationRequest = LocationRequest.create();
// locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(INTERVAL);
locationRequest.setFastestInterval(FASTEST_INTERVAL);
this.LauncherActivity = LauncherActivity;
googleApiClient = new GoogleApiClient.Builder(LauncherActivity)
.addApi(LocationServices.API).addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).build();
if (googleApiClient != null) {
Log.i(LogConstants.INFO_LOG, "googleApiClient is not null");
//the console prints this
googleApiClient.connect();
}
}
@Override
public void onConnected(Bundle connectionHint) {
Log.i(LogConstants.INFO_LOG, "GoogleApiClient connected");
Location currentLocation = fusedLocationProviderApi.getLastLocation(googleApiClient);
if (currentLocation != null && currentLocation.getTime() > REFRESH_TIME) {
location = currentLocation;
} else {
fusedLocationProviderApi.requestLocationUpdates(googleApiClient,locationRequest, locListen);
// Schedule a Thread to unregister location listeners
Executors.newScheduledThreadPool(1).schedule(new Runnable() {
@Override
public void run() {
fusedLocationProviderApi.removeLocationUpdates(googleApiClient, locListen);
}
}, ONE_MIN, TimeUnit.MILLISECONDS);
}
}
com.google.android.gms.location.LocationListener locListen=new com.google.android.gms.location.LocationListener() {
@Override
public void onLocationChanged(Location location) {
Log.i(LogConstants.INFO_LOG, "75location::"+location);
}
};
public Location getLocation() {
return this.location;
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
}
我的活动课程我正在调用oncreate
//show error dialog if GoolglePlayServices not available
if (!isGooglePlayServicesAvailable()) {
finish();
}
fusedLocation = new FusedLocation(this);
Location location = fusedLocation.getLocation();
String locationResult = "";
if (null != location) {
Log.i(LogConstants.INFO_LOG, location.toString());
double latitude = location.getLatitude();
double longitude = location.getLongitude();
Log.i(LogConstants.INFO_LOG, "longitude::!"+longitude);
float accuracy = location.getAccuracy();
/*double elapsedTimeSecs = (double) location.getElapsedRealtimeNanos()
/ 1000000000.0;*/
String provider = location.getProvider();
double altitude = location.getAltitude();
locationResult = "Latitude: " + latitude + "\n" +
"Longitude: " + longitude + "\n" +
"Altitude: " + altitude + "\n" +
"Accuracy: " + accuracy + "\n" +
"Elapsed Time: " + " secs" + "\n" +
"Provider: " + provider + "\n";
} else {
locationResult = "Location Not Available!";
Log.i(LogConstants.INFO_LOG, "Location Not Available!");
}
private boolean isGooglePlayServicesAvailable() {
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
Log.i(LogConstants.INFO_LOG, "status:"+status);
if (ConnectionResult.SUCCESS == status) {
return true;
} else {
GooglePlayServicesUtil.getErrorDialog(status, this, 0).show();
return false;
}
}
LOcation始终为null。听众似乎没有工作。
答案 0 :(得分：3)
首先，如果您正在使用模拟器，则必须手动设置位置：
telnet localhost 5554
连接时运行命令
geo fix <longitude> <latitude>
如此处所述 Using the emulator #geo或此处how-to-emulate-gps-location-in-the-android-emulator。我建议你在模拟器启动时立即这样做，显然是在应用程序启动之前。
其次，您的 FusedLocation 未实现 LocationListener ，因为它是您发布的示例中的内容。您必须实现该接口，然后在 FusedLocation 中实现 onLocationChanged 方法。 无论如何，我认为你试图在应用程序启动后立即加载该位置，对吧？那么你发布的例子不会以这种方式工作，但是用户通过可见的按钮询问位置。如果要在开头加载位置，可以修改示例代码，如下所示：
FusedLocationService 是你的 FusedLocation 类import android.app.Activity;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.FusedLocationProviderApi;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
public class FusedLocationService implements
LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
private static final String TAG = "FusedLocationService";
private static final long INTERVAL = 1000 * 30;
private static final long FASTEST_INTERVAL = 1000 * 5;
private static final long ONE_MIN = 1000 * 60;
private static final long REFRESH_TIME = ONE_MIN * 5;
private static final float MINIMUM_ACCURACY = 50.0f;
Activity locationActivity;
private LocationRequest locationRequest;
private GoogleApiClient googleApiClient;
private Location location;
private FusedLocationProviderApi fusedLocationProviderApi = LocationServices.FusedLocationApi;
FusedLocationReceiver locationReceiver = null;
public FusedLocationService(Activity locationActivity, FusedLocationReceiver locationReceiver) {
this.locationReceiver = locationReceiver;
locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(INTERVAL);
locationRequest.setFastestInterval(FASTEST_INTERVAL);
this.locationActivity = locationActivity;
googleApiClient = new GoogleApiClient.Builder(locationActivity)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
if (googleApiClient != null) {
googleApiClient.connect();
}
}
@Override
public void onConnected(Bundle connectionHint) {
Log.i(TAG, "I'm connected now");
Location currentLocation = fusedLocationProviderApi.getLastLocation(googleApiClient);
if (currentLocation != null && currentLocation.getTime() > REFRESH_TIME) {
location = currentLocation;
} else {
fusedLocationProviderApi.requestLocationUpdates(googleApiClient, locationRequest, this);
// Schedule a Thread to unregister location listeners
Executors.newScheduledThreadPool(1).schedule(new Runnable() {
@Override
public void run() {
fusedLocationProviderApi.removeLocationUpdates(googleApiClient,
FusedLocationService.this);
}
}, ONE_MIN, TimeUnit.MILLISECONDS);
}
}
@Override
public void onLocationChanged(Location location) {
Log.i(TAG, "Location is changed!");
//if the existing location is empty or
//the current location accuracy is greater than existing accuracy
//then store the current location
if (null == this.location || location.getAccuracy() < this.location.getAccuracy()) {
this.location = location;
// let's inform my client class through the receiver
locationReceiver.onLocationChanged();
//if the accuracy is not better, remove all location updates for this listener
if (this.location.getAccuracy() < MINIMUM_ACCURACY) {
fusedLocationProviderApi.removeLocationUpdates(googleApiClient, this);
}
}
}
public Location getLocation() {
return this.location;
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
}
这是接收器
public abstract class FusedLocationReceiver {
public abstract void onLocationChanged();
}
这是活动
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.app.Activity;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
public class MainActivity extends Activity {
private static final String TAG = "MyActivity";
Button btnFusedLocation;
TextView tvLocation;
FusedLocationService fusedLocationService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//show error dialog if GoolglePlayServices not available
if (!isGooglePlayServicesAvailable()) {
finish();
}
setContentView(R.layout.activity_main);
tvLocation = (TextView) findViewById(R.id.tvLocation);
fusedLocationService = new FusedLocationService(this, new FusedLocationReceiver(){
@Override
public void onLocationChanged() {
Log.i(TAG, "I'm the receiver, let's do my job!");
updateUI();
}
});
btnFusedLocation = (Button) findViewById(R.id.btnGPSShowLocation);
btnFusedLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
updateUI();
}
});
}
private void updateUI() {
Location location = fusedLocationService.getLocation();
String locationResult = "";
if (null != location) {
Log.i(TAG, location.toString());
double latitude = location.getLatitude();
double longitude = location.getLongitude();
float accuracy = location.getAccuracy();
double elapsedTimeSecs = (double) location.getElapsedRealtimeNanos()
/ 1000000000.0;
String provider = location.getProvider();
double altitude = location.getAltitude();
locationResult = "Latitude: " + latitude + "\n" +
"Longitude: " + longitude + "\n" +
"Altitude: " + altitude + "\n" +
"Accuracy: " + accuracy + "\n" +
"Elapsed Time: " + elapsedTimeSecs + " secs" + "\n" +
"Provider: " + provider + "\n";
} else {
Log.i(TAG, "Location Not Available!");
locationResult = "Location Not Available!";
}
tvLocation.setText(locationResult);
}
private boolean isGooglePlayServicesAvailable() {
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (ConnectionResult.SUCCESS == status) {
return true;
} else {
GooglePlayServicesUtil.getErrorDialog(status, this, 0).show();
return false;
}
}
}
基本上，当您实例化 FusedLocationService 时，您会为该位置准备好的 FusedLocationService 调用一个对象（接收方）。警告：这只会给你一次位置。
答案 1 :(得分：2)
您还可以启用或不启用GPS条件：
//exceptions will be thrown if provider is not permitted.
try {
gpsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if(gpsEnabled) {
// Your Code....
}
} catch (Exception ex) {
Log.e("TAG", "GPS Error : " + ex.getLocalizedMessage());
}
感谢。